: This indicates the video resolution. The "1080" represents 1,080 horizontal lines of vertical resolution, while the "p" stands for progressive scanning (where every line is drawn in each frame, offering a smoother image than interlaced "1080i" video). This is standard Full High Definition (Full HD) with an aspect ratio of 16:9.
To understand why this specific string is searched, you have to break down its technical components: Cars.2006.1080p.BluRay.x264.AAC-ETRG
This guide is for educational purposes, explaining the technical naming conventions used in digital media files. Downloading copyrighted material without authorization may violate copyright laws in your jurisdiction. : This indicates the video resolution